Having issues baking normal maps for this small pot, how can I fix it?
Normals around edges tend to look funky because it is  where there is the most visible difference between objects. In this case, it may depend more on how closely the edges of the the two objects are aligned. 

Perhaps I can respond better to your question if you share what the lower LOD object looks like with the normal map. 

Similar issues related to Normals and visible seams in renders include the following: Make sure the normal map is non-color instead of RGB at the bottom of the node. This is a common issue for visible seams. Also, other programs such as Unreal use a different standard for normal maps where the Y axis (green channel) inverted from what is standrd in Blender, which also makes seams visible and incorrect shading in the final bake. I see from what you've shared this isn't about the render view, but it's helpful to have this info for anyone with related issues.